A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava, tephra, pumice, and volcanic ash.nlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic explosive eruptions and effusive eruptions, although some have collapsed craters called calderas. The lava flowing from stratovolcanoes typically cools and hardens before spreading far due to high viscosity.
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Longitudinal vs Transverse Wave. A wave is a disturbance which moves away from what created it and changes the thing that it travels on like the surface of the ocean or the air. This is caused by the transfer of energy that disturbs its medium or channel. There are several types of waves, and two of them are longitudinal and transverse waves. A longitudinal wave is a wave wherein the movement of the channel or medium is in the same direction as the wave. This causes particles to move left and right inducing other particles to oscillate or vibrate. The primary wave or P-wave in an earthquake is an example of a longitudinal wave.